After Upgrading to Ubuntu Focal (20.04) unfortunately the sound on my Lenove Yogabook 11e stopped working.
More concrete it didn't show any of the two sound devices I found by cat /proc/asound/cards in the shell, but an
It took me some searches to find the following sources that let me fix the problem and get back a working sound system:
<cli> echo „options snd-hda-intel dmic_detect=0“ | sudo tee -a /etc/modprobe.d/alsa-base.conf
echo „blacklist snd_soc_skl“ | sudo tee -a /etc/modprobe.d/blacklist.conf
</cli>
<cli> pulseaudio -k && sudo alsa force-reload </cli>
With this Kernel it suddenly became necessary to
<cli> pulseaudio -k && sudo alsa force-reload </cli>
once after a fresh reboot.
:eyeroll: Six days later the commented lines have to be uncommented again. Just because ....
... before you reload alsa you must do
<cli>sudo killall timidity</cli>
It seems that this line actually is sufficient to fix the problem! Just try it if you just have a dummy device.
<markdown>Either you have to redo </markdown>
<cli>pulseaudio -k && sudo alsa force-reload</cli>
<markdown>again or the soundcard will appear immediately.
</markdown>